Area of circle: pi*10^2 = 100*pi square inches
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A 20-inch diameter circle contains: 314.16 square inches.
The area of a circle with a diameter of 20 cm is: 314.2 cm2
Area = pi*102 = 314.159 square inches to 3 decimal places
The diameter of the circle works out as 20 units to the nearest whole number
A circle with a radius of 10 cm has an area of 314.16 square cm